We turn to the latest firestorm over obama care. One of the core promises being called a lie. As kathleen sebelius, taking the hot seat on capitol hill today. Jim avila will be there, too. All this is happening as we learn of a new report from inside the administration that warned the website problems were coming. Reporter: That's right, george. Good morning. There's expected to be fireworks on capitol hill today. Another showdown, as the obama administration continues on the defensive over its signature health care plan. Today, the woman in charge of obama care, the embattled health and human services secretary, kathleen sebelius, is expected to blame the failures of healthcare.Gov on contractors who built the site. And in a prepared remark, distributed in advance, she takes none of the blame. Even though a document posted overnight by a congressional committee, shows that the main contractor did warn the government more testing was needed before launch. All this the day after an obama administration official apologized for the first time, for the errant website. To the millions of americans who attempted to use healthcare.Gov to shop and enroll in health care coverage, I want to apologize to you. We know how desperately you need affordable coverage. Reporter: But there was no apology from the white house, for another obama care dust-up, the offutt repeated claim -- if you like your plan, you can keep your plan. If you like your doctor, you can keep your doctor. Reporter: Republicans say the president misled the public. Some called it a lie because 15 million americans may, in fact, lose the cheap, underperforming insurance they have now. There was a glitch in openness and honesty to the american people, in terms you cannot keep health insurance. Reporter: But the obama administration says hold on. Even if this was oversold, the underinsured will be better off under obama care, getting better insurance at about the same price.

This transcript has been automatically generated and may not be 100% accurate.

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